Fix zoom level.

Zoom level may be float and should not be cast to integer.

map_machine/map_configuration.py

@@ -58,7 +58,7 @@ class MapConfiguration:
 
     @classmethod
     def from_options(
-        cls, options: argparse.Namespace, zoom_level: int
+        cls, options: argparse.Namespace, zoom_level: float
     ) -> "MapConfiguration":
         """Initialize from command-line options."""
         return cls(

map_machine/mapper.py

@@ -191,7 +191,7 @@ def ui(arguments: argparse.Namespace) -> None:
     :param arguments: command-line arguments
     """
     configuration: MapConfiguration = MapConfiguration.from_options(
-        arguments, int(arguments.zoom)
+        arguments, float(arguments.zoom)
     )
     cache_path: Path = Path(arguments.cache)
     cache_path.mkdir(parents=True, exist_ok=True)

map_machine/ui.py

@@ -159,7 +159,7 @@ def add_tile_arguments(parser: argparse.ArgumentParser) -> None:
         "-z",
         "--zoom",
         type=str,
-        metavar="<integer>",
+        metavar="<range>",
         help="OSM zoom levels; can be list of numbers or ranges, e.g. `16-18`, "
         "`16,17,18`, or `16,18-20`",
         default="18",
@@ -233,8 +233,8 @@ def add_render_arguments(parser: argparse.ArgumentParser) -> None:
     parser.add_argument(
         "-z",
         "--zoom",
-        type=int,
-        metavar="<integer>",
+        type=float,
+        metavar="<float>",
         help="OSM zoom level",
         default=18,
     )